Source: Pirates of the Caribbean: The Curse of the Black Pearl
Dialogue: PIRATES YE BE WARNED
Captain Jack Sparrow is sailing on a small boat and passes by three skeletons of pirates hanging from a noose on a rocky cliff, with a sign that says 'Pirates Ye Be Warned'. Jack looks up at the skeletons and mockingly tips his hat to them in a salute.
This is a classic reaction meme used to acknowledge people, situations, or groups that are doomed, reckless, or setting themselves up for a disaster. It serves as a sarcastic tip of the cap to someone who is clearly walking into a trap, making a bad life decision, or acting like an idiot.
